104 



PROCEEDINGS OP SECTION A. 



The &3 curve for pure sine excitation must therefore lie between 

 the two curves for o, in Eig. II. 



8. The most important of the magnetic charactei^istics of iron are 

 /t„ and 0, as from these its behaviour is to the first order determined. 



The curves in Fig. 111. show how /^^ varies under different condi- 

 tions of indiictio]! density and frequency, while'tlie curves in Fig. IV. 

 show the variations of B. 



